Abstract: A system and method for a multichannel voltage recording device is described. A multichannel voltage recording device comprises at least three electrodes disposed across a conductive material. The electrodes are configured to be coupled to a skin of a user. A frame comprises the conductive material that is configured to receive a driven right leg (DRL) signal based on the voltage signals from the at least three electrodes.

Abstract: A wearable computing device includes a display device for displaying augmented reality (AR) images and a biometric monitor for monitoring biometric sensor data obtained by a biometric sensor. The biometric monitor determines whether the biometric data indicates that a user associated with the biometric data could be experiencing a health-related problem. The biometric monitor is configured with various modules to perform deviation-induced dynamic modulation in making this determination.

Abstract: A wearable computing device includes a display device for displaying augmented reality (AR) images and a biometric sensor for obtaining a heartrate of a user wearing the wearable computing device. The biometric sensor includes a photosensor that emits a light into the surface of a body part of the user. Using photoplethysmography, the photosensor measures voltages from the light reflected from or transmitted through the user's body part at a sampling rate of at least 100 Hz. The measured voltages are then filtered and normalized. Slopes for the resulting set of voltages are then determined on a sliding window basis of approximately 90 milliseconds (ms). Interpulse intervals are then determined for consecutive local minima within each set of sliding windows. The biometric sensor then computes a real-time heartrate for the user from the interpulse intervals, which may then be displayed on the display device of the wearable computing device.

Abstract: A system and method for a multichannel voltage recording device is described. A multichannel voltage recording device comprises at least three electrodes disposed across a conductive material. The electrodes are configured to be coupled to a skin of a user. A frame comprises the conductive material that is configured to receive a driven right leg (DRL) signal based on the voltage signals from the at least three electrodes.

Abstract: A system and method for identifying changes in a state or activity is described. A real-time event monitoring application, implemented in a hardware processor, computes features over varying sampling periods, which are stored in cascading buffers. The various sampling periods enable determination of trends of a computed feature, comparison of the trends of the computed feature with trends of other features, normalization of the computed feature based on the same or different features at the same or different time scales, scaling of the normalized computed feature relative to other features at the same or different time scale, and identification of a change in state or activity based on a scaled normalized computed feature.

Abstract: A system and method for identifying changes in a state or activity is described. A real-time event monitoring application, implemented in a hardware processor, computes features over varying sampling periods, which are stored in cascading buffers. The various sampling periods enable determination of trends of a computed feature, comparison of the trends of the computed feature with trends of other features, normalization of the computed feature based on the same or different features at the same or different time scales, scaling of the normalized computed feature relative to other features at the same or different time scale, and identification of a change in state or activity based on a scaled normalized computed feature.

Abstract: A system and method for determining a quality of contact of an electroencephalogram (EEG) electrode is described. An electrode is connected to a user to detect brainwave activity from the user. An EEG application computes a voltage of the electrode, computes a derivative of the voltage of the electrode, computes a coefficient of variation from the derivative of the voltage, and determines a quality of contact of the electrode to the user based on the coefficient of variation.